Submission #2009197

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Source Code Expand

#include<bits/stdc++.h>
using namespace std;

int N, M;
int A[200010], psum[200010], dp[200010];

struct BIT {
    vector<int> tree;
    void init() {
        tree = vector<int>(4*N, -1e9);
    }
    void upd(int idx, int val, int l, int r, int n) {
        if(idx < l || r < idx) return;
        if(l == r) {
            tree[n] = val;
            return;
        }
        int m = (l + r)>>1;
        upd(idx, val, l, m, 2*n);
        upd(idx, val, m + 1, r, 2*n + 1);
        tree[n] = max(tree[2*n], tree[2*n + 1]);
    }
    int quer(int a, int b, int l, int r, int n) {
        if(b < l || r < a) return -1e9;
        if(a <= l && r <= b) return tree[n];
        int m = (l + r)>>1;
        int L = quer(a, b, l, m, 2*n);
        int R = quer(a, b, m + 1, r, 2*n + 1);
        return max(L, R);
    }
} bit;

void solve() {
    bit.init();
    dp[N - 1] = 0;
    for(int i = N - 2; i >= 1; i--) {
        bit.upd(i + 1, -dp[i + 1] + A[i + 1] - psum[i], 0, N - 1, 1);
        dp[i] = bit.quer(i + 1, N - 1, 0, N - 1, 1) + psum[i];
    }
}

int main() {
    scanf("%d", &N);

    for(int i = 0; i < N - 1; i++) {
        scanf("%d", &A[i]);
    }
    for(int i = 0; i < N - 1; i++) {
        psum[i] = A[i];
        if(i) psum[i] += psum[i - 1];
    }

    scanf("%d", &M);

    for(int i = 0; i < M; i++) {
        scanf("%d", &A[N - 1]);

        solve();

        printf("%d\n", A[0] - A[1] + dp[1]);
    }
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:43:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d", &N);
                    ^
./Main.cpp:46:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d", &A[i]);
                           ^
./Main.cpp:53:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d", &M);
                    ^
./Main.cpp:56:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d", &A[N - 1]);
                               ^

Judge Result